Brake structure



May '13, 1930. J, SNEED 1,758,066

BRAKE STRUCTURE Filed Aug. l, 1927 2 Sheets-Sheet l May 13, 1930. SNEED 1,758,066

BRAKE STRUCTURE Filed Aug. 1, 1927 2 Sheets-Sheet 2 F IG 6 Patented May 1930- JOHNsNEED, F DETROIT, MICHIGAN, ASS

IGNOR 'J .O THE IMII-DLAND STEEL rnonuc'rs COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO BRAKE STRUCTURE Application filed August 1, 1927. Serial No. 209,685.

This invention relates to brakes, and pal-ti cularly to a plural shoe brake of the internal expanding type, and-adapted for use inan automobile. v It is among the objects of my invention to economically construct a brake which is equally efi'ectiveregardless of the direction of drum rotation; the parts of which are easily made and quickly assembled, which 1-0 will have a self-energized or servo action and which uniformly -distributes the wear throughout the entire lining surface.

Other objects include a system of anchorage along with a mounting for various shoes and 15, the particular structure of the separate shoes.

@ther objects will appear from the following description which relates to the accompanying drawings, a preferred form of my invention is illustrated herewith. The essen- 20 tial characteristics are summarized in the claims. 4 v

In the drawings; Fig. 1 is an elevation showing the generalarrangement of the brake shoes; Fig. 2 is a section taken along the line 25 2 2 of Fig. 1; Fig. 3 is a section taken along the line 33 of Fig. 1; F ig.-4 is a section taken along-the line Jr-A of Fig. 1;; Fig. 51is a section taken along the line 55 of Fig. 1; Fig. 6 is a'section taken along. the line 6-6 of Referring particularly to Fig. 1, I show the -usual brake drum D within which are mounted shoes A,'B and G. The shoes support suitable brake lining L. The shoes-may be channelled in cross section (-see Figs. 4, 5 and 6) and may have a lining supporting portion 10 and inwardly extending radial side flanges 11. I provide anchor pins or stops and 16 against which the ends of the shoe Bare drawn when the shoe is in idle position, by a suitable retracting spring 17 sesured to the backing plate (see F 4.) through the pin and bracket 21. The ends of the sjl'ioeB are cut away as at 18 and 19 leavinga radial edge; and an inclined circum ferentiallyextending edge. The corners are rounded toconform with the surface of the anchor pins. 'In -this manner the shoe B may 3 either pivot about either of the anchor pins or may move radially-with relation'to either locate the innerv idle the side flanges 11' of the shoes -VVhen the shoe is retracted by the spring 17, the inclinedsurface at the ends of theshoe, engage the anchor pins so as to center the'shoe inits retracted position. The anchor pins 15 and 16 (see Fig. 5) are carried by the backing plate 20 with suitable bracket 22.

of them.

A third anchor pin or stop member 30 ispositioned betweenadjacent ends of the shoes A and C. Auxiliary retraction stop pins such as those shown at 30A are provided to position of the shoes A and C. WVhen the shoes A and C are in idle position, their ends are the pins 30 and 30A by the springs 31. In the form illustrated. herewith, the ends of A and C are drawnagainst squared and engage the flattened radial surfaces of the anchor pin 30 as at 32 and 33. In this manner the shoes A and C are limited in their circumferential movement relative to thepin 30, but are permitting a sliding radial movement therewith. The pins'39 and 30A may be suitably carried on the backing, plate in any convenient manner; no particuw lar embodiment is shown herewith.

To effect operation of the brake, means are provided for spreading the adjacent endsiof the shoes A and C. I have illustrated a floating toggle arrangement (see also Fig. 2), which toggle may be actuated by a cable 35 or other suitable means. The cable is adapt- .ed to draw on the center pin 36 which engages the arms of the toggle 37 and 38. The arms of the toggle are bifurcated, both in a horizontal and vertical plane, and these arms in turn'engage pins 39 and 40, which in turn are mounted in larger pins 41 and 42. The larger pins have flattened surfaces as at 43 on which thetoggle arms may rest. The pins 41 and 42 are pivotally mounted in the side flanges 11 of the channel shaped shoes and are held in' place by suitable means, such as cotter ins. The expanding means may float circum ierentially and maintain a uniform expanding force, and is provided with a universal connection with the adjacent ends of the shoes A and C.

Referring particularly to Figs. 1, 3 and 4, I have illustrated the mounting for the other ends of the shoes A and-C. Extending between the side flanges 11 of the shoe B and pivotally mounted therein, is a pin 50 which in the form shown,-is secured in'thelink or walking beam 60. -A set screw 51 maybe provided, if it isdesired, to journal the pins in the side flanges rather than in the link.

The link'60 may have circumferentially extending arms 61 and 62 which in turn carry pins 52 and 53. Thesepins may be held in place by set screws '54, or other suitable means. The pins 52 and-53 also pivotally engage extensions 65 and 66 of the side flanges ,of the shoesA and C. These extensions may be made integral with the shoes A and C, andI prefer to" extend the side flanges and bring themcloser together than the side'flanges'll, so they may lie within the side flanges 11 of the shoe B, (seeFigUG) In operation, 'supposingthe direction of drum rotation to be clockwise,,the adjacent ential, so that-the shoe B- is either or both pivoted or slid along or around the anchor in 15 into engagement with the drum 7 throughout substantially its entire working length. The end of the shoe B adjacent the anchor pin 16 is moved outwardly from that pin. Meanwhile, the shoe A is forced against the drum and also forced against the anchor or stop member 30 so that to a limited ex tent, the pin 50 tends to follow a circle, of which the anchor 30 is the'center. The pin 50 also tends to follow a circle, of which the anchor pin 15 is the center. In either event, the shoe Cserv-es or acts-as a servo shoe, for both the shoes A and B, and substantially 360 of lining engagement is ,effected. It will be seen that a similar operation follows if the direction of drum rotation is counter clockwise, in which event, the shoe A acts as a servo shoe for both of the other shoes.

It will be seen from. the foregoing that a novel and eminently useful brake is provided. Certain modifications will appear to one skilled in the art without departing from the spirit of my invention. While I have shown a preferred form of my invention,I do not care to be limited in the scope thereof other than by the claims appended hereto.

' I claim 1. A brake having a pair of shoes and a link pivotally supported in its'middle and connected at its ends to said shoes whereby movement ofsone of said shoes in one direction forces the other shoe to move in the op-,,

posite direction.

2. A brake having a pair of shoes and expansion means acting upon adjacent ends of said shoes, and a rocking link supported in its middle and in pivotal engagement at its ends with the other ends of said shoes, said link being bodily movable circumferentially of said drum.

3. In a brake, the combination ofa plurality of shoes and means for expanding the shoes positioned between adjacent ends of two of the shoes, the other ends of said shoes, said linkbeing pivotally mounted in a third shoe.

4. In a brake, the combination of a shoe, a fixed anchor forone end of saidshoe, a link pivotally mounted in said shoe, and a second shoe pivotally connected with said link and engaging the drum beyond said first named shoe and beyond said anchor.

5. In .a brake, the combination of a brake shoe, ananchor disposed at each end of said shoe, a link pivotally mounted in said shoe, a pair'of'shoes each lying beyond the end of said first named shoe and having a pivotal connection with opposite ends of-said link.

6. In a brake, the combination of a brake shoe, an anchor disposed at each end of said shoe, a link pivotally mounted in said shoe,

a shoe lyingbeyond the end of said first named shoe and having a part bridging said anchor and pivotally connected with one end of said link.

7. In a brake, the combinationof a shoe being channeled in cross section, having inwardly extending radial side flanges remote from the ends of said shoe, a pin journalled in said side flanges, a link mounted on the pin and rockable within said side flanges, means connected with said link for moving said shoe. I

8. In a brake, thecombination of a shoe being channeled in cross section, having inwardly extending radial side flanges, a pin ,journalled in said side flanges in the mid portion of said shoeand a link mounted on the pin and rockable within said side flanges.

9. In a brake, thecombination of a brake shoe' being channeled in cross section and having inwardly extending radial side flanges, the ends of said side flanges being cut away, said side flanges having a pair of aligned openings at the mid portion of said shoe, anchoring pins engaging the said cut away ends of the shoes and a pin pivotally mounted in said aligned openings.

10. In a plural shoe brake, a pair of shoes, anchoring means disposed between adjacent ends of said shoes, circumferential extensions formed on the other ends of said shoes, a third shoe, a link having a pair of arms and pivot ally mounted in said shoe, the ends of the a link pivotally engaging of three ilarlyformed,

' between the ends tion with said drum,

arms of said link pivotally connected to said extensions. L 11. In a plural shoe brake, the combination of a brake drum, a pairof shoes mounted within said drum, anchoring means disposed of said shoes, means for spreading the said ends of said shoes positioned adjacent said anchoring means, said shoes engaging'said anchor along radial sur faces, a link pivoted in its mid portion and connected with the other ends of said shoes whereby a downward motion of one ,ofsaid Y es tends to cause an upward motion of the or er of said shoes along the said radial surfaces of said anchor.

12. In a plural shoe brake, the combination of a pair of shoes, anchoring means disposed between the ends of said shoes, said shoes engaging said anchor along radial surfaces, a link pivoted in its mid'portion and connected with said shoes at its ends whereby a downward motion of one of said shoes tends to cause an upward motion of the other of said shoes along the said radial surfaces of said anchor.

13. A plural shoe brake, the combination shoes, two of said shoes being simmeans disposed near the adj acent ends of said similarly formed shoes for limiting the circumferential movement thereof, a third shoe and a link pivotally carried thereby and connected to the other ends of said two shoes, means disposed at both ends of said third shoe for limiting circumferential movement and inward radial movement of said third shoe,

and means for drawing said shoes inwardly when said brake is idle.

lab-The combination of a brake drum, a plurality of shoes disposed in operative relaone of said shoes being anchorable at either end and operatively connected with the others of said shoes,.said first named shoe being channeled in cross'section and having inwardly extending radial side flanges and a lining supporting portion, said side flanges being cut away near theends of said shoe along a radial line and thence along a line inclinedrelative to the lining supporting portion of the shoe to the end of the shoe, anchor pins disposed at the ends of said shoe and adapted to be engaged by the cut away ends of said shoe and means for drawing said shoe against said anchor pins when the brake is idle.

v 15. In a plural shoe brake, the combination of a pair of shoes, anchoring means disposed between the ends of said shoes, said shoes engaging said anchor along radial surfaces, a link pivoted in its mid portion and connected with said shoes at its ends whereby a downward motion of one of said shoes tends to cause an upward motion 'of the other of said shoes along the said radial surfacesof'said extlgnding side flanges for supporting said 16. In a plural shoe brake, the combination of-a pair of shoes, anchoring means disposed between the ends of said shoes, said shoes engaging said anchor along radial surfaces, a link pivoted in its mid portion and connected with said shoes at its ends whereby a down ward. motion of one of "said shoes tends to cause an upward motion of the other of said shoes along the said radial surfaces of said anchor, and a third shoe anchorable at least at one end and pivotally supporting said link.

17. In a plural shoe brake, the combination of a pair of shoes, anchoring means disposed between the ends of said shoes, said shoes engaging said anchor along radial surfaces, a link pivotedin its mid portion and connected with said shoes at its ends whereby a downward motion of one of said shoes tends to cause an upward motion of the' other of said shoes along the said radial surfaces of said anchor, a pair of separate anchor pins .not engaged by said shoes and a third shoe positioned between said anchor pins and engageable with at least oneof them, said third shoe supporting said link.

In testimony whereof, I hereunto a'flix my signature.

anchor, and a third shoe having inwardly JOHN SNEED. 

